Method and apparatus transmitting sidelink CSI

ABSTRACT

According to an embodiment of the present disclosure, there may be provided a method of transmitting SL CSI by a first apparatus. The method may include generating the SL CSI related to a channel state between the first apparatus and a second apparatus in a MAC CE format, and transmitting the SL CSI to the second apparatus.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e), this application is a continuation ofInternational Application No. PCT/KR2020/003812, with an internationalfiling date of Mar. 19, 2020, which claims the benefit of U.S.Provisional Application No. 62/820,289 filed on Mar. 19, 2019, thecontents of which are all hereby incorporated by reference herein intheir entirety.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic.

Vehicle-to-everything (V2X) refers to a communication technology throughwhich a vehicle exchanges information with another vehicle, apedestrian, an object having an infrastructure (or infra) establishedtherein, and so on. The V2X may be divided into 4 types, such asvehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as BSM(Basic Safety Message),CAM(Cooperative Awareness Message), and DENM(Decentralized EnvironmentalNotification Message) is focused in the discussion on the RAT usedbefore the NR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

For example, the CAM may include dynamic state information of thevehicle such as direction and speed, static data of the vehicle such asa size, and basic vehicle information such as an exterior illuminationstate, route details, or the like. For example, the UE may broadcast theCAM, and latency of the CAM may be less than 100 ms. For example, the UEmay generate the DENM and transmit it to another UE in an unexpectedsituation such as a vehicle breakdown, accident, or the like. Forexample, all vehicles within a transmission range of the UE may receivethe CAM and/or the DENM. In this case, the DENM may have a higherpriority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

For example, based on the vehicle platooning, vehicles may move togetherby dynamically forming a group. For example, in order to perform platoonoperations based on the vehicle platooning, the vehicles belonging tothe group may receive periodic data from a leading vehicle. For example,the vehicles belonging to the group may decrease or increase an intervalbetween the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may besemi-automated or fully automated. For example, each vehicle may adjusttrajectories or maneuvers, based on data obtained from a local sensor ofa proximity vehicle and/or a proximity logical entity. In addition, forexample, each vehicle may share driving intention with proximityvehicles.

For example, based on the extended sensors, raw data, processed data, orlive video data obtained through the local sensors may be exchangedbetween a vehicle, a logical entity, a UE of pedestrians, and/or a V2Xapplication server. Therefore, for example, the vehicle may recognize amore improved environment than an environment in which a self-sensor isused for detection.

For example, based on the remote driving, for a person who cannot driveor a remote vehicle in a dangerous environment, a remote driver or a V2Xapplication may operate or control the remote vehicle. For example, if aroute is predictable such as public transportation, cloud computingbased driving may be used for the operation or control of the remotevehicle. In addition, for example, an access for a cloud-based back-endservice platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2Xscenarios such as vehicle platooning, advanced driving, extendedsensors, remote driving, or the like is discussed in NR-based V2Xcommunication.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a sidelink (SL) communication methodbetween apparatuses (or UEs) based on vehicle-to-everything (V2X)communication, and an apparatus (or UE) performing the method.

The present disclosure also provides a method and apparatus performinglong-term evolution (LTE) SL communication between apparatuses based onV2X communication in a wireless communication system.

The present disclosure also provides a method and apparatus fortransmitting SL channel state information (CSI) to another apparatusthrough a MAC control element (CE).

According to an embodiment of the present disclosure, there may beprovided a method of transmitting SL CSI by a first apparatus. Themethod may include generating the SL CSI related to a channel statebetween the first apparatus and a second apparatus in a MAC CE format,and transmitting the SL CSI to the second apparatus.

According to an embodiment of the present disclosure, there may beprovided a first apparatus for transmitting SL CSI. The first apparatusmay include at least one memory storing instructions, at least onetransceiver, and at least one processor connected to the at least onememory and the at least one transceiver. The at least one processor maybe configured to generate the SL CSI related to a channel state betweenthe first apparatus and a second apparatus in a MAC CE format, andcontrol the at least one transceiver to transmit the SL CSI to thesecond apparatus.

According to an embodiment of the present disclosure, there may beprovided an apparatus (or a chip(set)) configured to control a first UE.The apparatus may include at least one processor, and at least onecomputer memory operably connectable to the at least one processor, andstoring instructions. The at least one processor may execute theinstructions to generate the SL CSI related to a channel state betweenthe first apparatus and a second apparatus in a MAC CE format, andtransmit the SL CSI to the second apparatus.

According to an embodiment of the present disclosure, there may beprovided a non-transitory computer-readable storage medium havinginstructions (or indications) stored thereon. When executed by at leastone processor, the instructions may cause the at least one processor togenerate, by a first apparatus, SL CSI related to a channel statebetween the first apparatus and a second apparatus in a MAC CE format,and transmit, by the first apparatus, the SL CSI to the secondapparatus.

According to an embodiment of the present disclosure, there is provideda method of receiving SL CSI by a second apparatus. The method mayinclude receiving, from a first apparatus, SL CSI of a MAC CE formatrelated to a channel state between the first apparatus and the secondapparatus.

According to an embodiment of the present disclosure, there is provideda second apparatus for receiving SL CSI. The second apparatus mayinclude at least one memory storing instructions, at least onetransceiver, and at least one processor connected to the at least onememory and the at least one transceiver. The at least one processor maycontrol the at least one transceiver to receive, from a first apparatus,SL CSI of a MAC CE format related to a channel state between the firstapparatus and the second apparatus.

According to the present disclosure, a user equipment (UE) (orapparatus) can effectively perform sidelink (SL) communication.

According to the present disclosure, vehicle-to-everything (V2X)communication can be effectively performed between apparatuses (or UEs).

According to the present disclosure, SL channel state information (CSI)reporting efficiency can be increased by transmitting SL CSI to anotherapparatus through a medium access control (MAC) control element (CE).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, inaccordance with an embodiment of the present disclosure.

FIGS. 4A and 4B show a radio protocol architecture, in accordance withan embodiment of the present disclosure.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure.

FIGS. 8A and 8B show a radio protocol architecture for a SLcommunication, in accordance with an embodiment of the presentdisclosure.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure.

FIGS. 10A and 10B show a procedure of performing V2X or SL communicationby a UE based on a transmission mode, in accordance with an embodimentof the present disclosure.

FIGS. 11A to 11C show three cast types, in accordance with an embodimentof the present disclosure.

FIG. 12 shows an example of physical channel and signal transmission towhich the present disclosure is applicable.

FIG. 13 shows a process in which a first apparatus transmits SL CSI to asecond apparatus, based on communication with a BS, in accordance withan embodiment of the present disclosure.

FIG. 14 shows a process in which a first apparatus transmits SL CSI to aBS or a second apparatus, based on communication with the BS, inaccordance with another embodiment of the present disclosure.

FIG. 15 shows a process in which a first apparatus transmits SL CSI to asecond apparatus, in accordance with an embodiment of the presentdisclosure.

FIG. 16 is a flowchart showing an operation of a first apparatus, inaccordance with an embodiment of the present disclosure.

FIG. 17 is a flowchart showing an operation of a second apparatus, inaccordance with an embodiment of the present disclosure.

FIG. 18 shows a communication system 1, in accordance with an embodimentof the present disclosure.

FIG. 19 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

FIG. 20 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

FIG. 21 shows a wireless device, in accordance with an embodiment of thepresent disclosure.

FIG. 22 shows a hand-held device, in accordance with an embodiment ofthe present disclosure.

FIG. 23 shows a car or an autonomous vehicle, in accordance with anembodiment of the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDDCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 2 may becombined with various embodiments of the present disclosure.

Referring to FIG. 2, a next generation-radio access network (NG-RAN) mayinclude a BS 20 providing a UE 10 with a user plane and control planeprotocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 3, the gNB may provide functions, such as Inter CellRadio Resource Management (RRM), Radio Bearer (RB) control, ConnectionMobility Control, Radio Admission Control, Measurement Configuration &Provision, Dynamic Resource Allocation, and so on. An AMF may providefunctions, such as Non Access Stratum (NAS) security, idle statemobility processing, and so on. A UPF may provide functions, such asMobility Anchoring, Protocol Data Unit (PDU) processing, and so on. ASession Management Function (SMF) may provide functions, such as userequipment (UE) Internet Protocol (IP) address allocation, PDU sessioncontrol, and so on.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (L1), a second layer (L2), and a thirdlayer (L3) based on the lower three layers of the open systeminterconnection (OSI) model that is well-known in the communicationsystem. Among them, a physical (PHY) layer belonging to the first layerprovides an information transfer service by using a physical channel,and a radio resource control (RRC) layer belonging to the third layerserves to control a radio resource between the UE and the network. Forthis, the RRC layer exchanges an RRC message between the UE and the BS.

FIGS. 4A and 4B show a radio protocol architecture, in accordance withan embodiment of the present disclosure. The embodiment of FIGS. 4A and4B may be combined with various embodiments of the present disclosure.Specifically, FIG. 4A shows a radio protocol architecture for a userplane, and FIG. 4B shows a radio protocol architecture for a controlplane. The user plane corresponds to a protocol stack for user datatransmission, and the control plane corresponds to a protocol stack forcontrol signal transmission.

Referring to FIGS. 4A and 4B, a physical layer provides an upper layerwith an information transfer service through a physical channel. Thephysical layer is connected to a medium access control (MAC) layer whichis an upper layer of the physical layer through a transport channel.Data is transferred between the MAC layer and the physical layer throughthe transport channel. The transport channel is classified according tohow and with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., the MAC layer, the RLC layer, and thepacket data convergence protocol (PDCP) layer) for data delivery betweenthe UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

The physical channel includes several OFDM symbols in a time domain andseveral sub-carriers in a frequency domain. One sub-frame includes aplurality of OFDM symbols in the time domain. A resource block is a unitof resource allocation, and consists of a plurality of OFDM symbols anda plurality of sub-carriers. Further, each subframe may use specificsub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of acorresponding subframe for a physical downlink control channel (PDCCH),i.e., an L1/L2 control channel. A transmission time interval (TTI) is aunit time of subframe transmission.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5, in the NR, a radio frame may be used for performinguplink and downlink transmission. A radio frame has a length of 10 msand may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined in accordance with subcarrier spacing (SCS).Each slot may include 12 or 14 OFDM(A) symbols according to a cyclicprefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subframe,u) _(slot)) inaccordance with an SCS configuration (u), in a case where a normal CP isused.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe in accordance withthe SCS, in a case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells. In theNR, multiple numerologies or SCSs for supporting diverse 5G services maybe supported. For example, in case an SCS is 15 kHz, a wide area of theconventional cellular bands may be supported, and, in case an SCS is 30kHz/60 kHz a dense-urban, lower latency, wider carrier bandwidth may besupported. In case the SCS is 60 kHz or higher, a bandwidth that isgreater than 24.25 GHz may be used in order to overcome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table A3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding frequency Subcarrier Spacingdesignation range (SCS) FR1  450 MHz-6000 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table A4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding frequency Subcarrier Spacingdesignation range (SCS) FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure. Referring to FIG. 6, a slotincludes a plurality of symbols in a time domain. For example, in caseof a normal CP, one slot may include 14 symbols. However, in case of anextended CP, one slot may include 12 symbols. Alternatively, in case ofa normal CP, one slot may include 7 symbols. However, in case of anextended CP, one slot may include 6 symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Meanwhile, a radio interface between a UE and another UE or a radiointerface between the UE and a network may consist of an L1 layer, an L2layer, and an L3 layer. In various embodiments of the presentdisclosure, the L1 layer may imply a physical layer. In addition, forexample, the L2 layer may imply at least one of a MAC layer, an RLClayer, a PDCP layer, and an SDAP layer. In addition, for example, the L3layer may imply an RRC layer.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier.

When using bandwidth adaptation (BA), a reception bandwidth andtransmission bandwidth of a UE are not necessarily as large as abandwidth of a cell, and the reception bandwidth and transmissionbandwidth of the BS may be adjusted. For example, a network/BS mayinform the UE of bandwidth adjustment. For example, the UE receiveinformation/configuration for bandwidth adjustment from the network/BS.In this case, the UE may perform bandwidth adjustment based on thereceived information/configuration. For example, the bandwidthadjustment may include an increase/decrease of the bandwidth, a positionchange of the bandwidth, or a change in subcarrier spacing of thebandwidth.

For example, the bandwidth may be decreased during a period in whichactivity is low to save power. For example, the position of thebandwidth may move in a frequency domain. For example, the position ofthe bandwidth may move in the frequency domain to increase schedulingflexibility. For example, the subcarrier spacing of the bandwidth may bechanged. For example, the subcarrier spacing of the bandwidth may bechanged to allow a different service. A subset of a total cell bandwidthof a cell may be called a bandwidth part (BWP). The BA may be performedwhen the BS/network configures the BWP to the UE and the BS/networkinforms the UE of the BWP currently in an active state among theconfigured BWPs.

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH, PDSCH,or CSI-RS (excluding RRM) outside the active DL BWP. For example, the UEmay not trigger a channel state information (CSI) report for theinactive DL BWP. For example, the UE may not transmit PUCCH or PUSCHoutside an active UL BWP. For example, in a downlink case, the initialBWP may be given as a consecutive RB set for an RMSI CORESET (configuredby PBCH). For example, in an uplink case, the initial BWP may be givenby SIB for a random access procedure. For example, the default BWP maybe configured by a higher layer. For example, an initial value of thedefault BWP may be an initial DL BWP. For energy saving, if the UE failsto detect DCI during a specific period, the UE may switch the active BWPof the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. The SL BWP may be (pre-)configured in a carrier withrespect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UEin the RRC_CONNECTED mode, at least one SL BWP may be activated in thecarrier.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure. The embodiment of FIG. 7 may be combined withvarious embodiments of the present disclosure. It is assumed in theembodiment of FIG. 7 that the number of BWPs is 3.

Referring to FIG. 7, a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

FIGS. 8A and 8B show a radio protocol architecture for a SLcommunication, in accordance with an embodiment of the presentdisclosure. The embodiment of FIGS. 8A and 8B may be combined withvarious embodiments of the present disclosure. More specifically, FIG.8A shows a user plane protocol stack, and FIG. 8B shows a control planeprotocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) andsynchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS)and a secondary sidelink synchronization signal (SSSS), as anSL-specific sequence. The PSSS may be referred to as a sidelink primarysynchronization signal (S-PSS), and the SSSS may be referred to as asidelink secondary synchronization signal (S-SSS). For example,length-127 M-sequences may be used for the S-PSS, and length-127 goldsequences may be used for the S-SSS. For example, a UE may use the S-PSSfor initial signal detection and for synchronization acquisition. Forexample, the UE may use the S-PSS and the S-SSS for acquisition ofdetailed synchronization and for detection of a synchronization signalID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit CRC.

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure. The embodiment of FIG. 9 may becombined with various embodiments of the present disclosure.

Referring to FIG. 9, in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIGS. 10A and 10B show a procedure of performing V2X or SL communicationby a UE based on a transmission mode, in accordance with an embodimentof the present disclosure. The embodiment of FIGS. 10A and 10B may becombined with various embodiments of the present disclosure. In variousembodiments of the present disclosure, the transmission mode may becalled a mode or a resource allocation mode. Hereinafter, forconvenience of explanation, in LTE, the transmission mode may be calledan LTE transmission mode. In NR, the transmission mode may be called anNR resource allocation mode.

For example, FIG. 10A shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, FIG. 10A shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, FIG. 10B shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, FIG. 10B shows a UE operation related to an NR resourceallocation mode 2.

Referring to FIG. 10A, in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (more specifically, downlink control information (DCI)), and theUE lmay perform V2X or SL communication with respect to a UE 2 accordingto the resource scheduling. For example, the UE 1 may transmit asidelink control information (SCI) to the UE 2 through a physicalsidelink control channel (PSCCH), and thereafter transmit data based onthe SCI to the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to FIG. 10B, in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIGS. 11A to 11C show three cast types, in accordance with an embodimentof the present disclosure. The embodiment of FIGS. 11A to 11C may becombined with various embodiments of the present disclosure.Specifically, FIG. 11A shows broadcast-type SL communication, FIG. 11Bshows unicast type-SL communication, and FIG. 11C shows groupcast-typeSL communication. In case of the unicast-type SL communication, a UE mayperform one-to-one communication with respect to another UE. In case ofthe groupcast-type SL transmission, the UE may perform SL communicationwith respect to one or more UEs in a group to which the UE belongs. Invarious embodiments of the present disclosure, SL groupcastcommunication may be replaced with SL multicast communication, SLone-to-many communication, or the like.

Meanwhile, in sidelink communication, a UE may need to effectivelyselect a resource for sidelink transmission. Hereinafter, a method inwhich a UE effectively selects a resource for sidelink transmission andan apparatus supporting the method will be described according tovarious embodiments of the present disclosure. In various embodiments ofthe present disclosure, the sidelink communication may include V2Xcommunication.

At least one scheme proposed according to various embodiments of thepresent disclosure may be applied to at least any one of unicastcommunication, groupcast communication, and/or broadcast communication.

At least one method proposed according to various embodiment of thepresent embodiment may apply not only to sidelink communication or V2Xcommunication based on a PC5 interface or an SL interface (e.g., PSCCH,PSSCH, PSBCH, PSSS/SSSS, etc.) or V2X communication but also to sidelinkcommunication or V2X communication based on a Uu interface (e.g., PUSCH,PDSCH, PDCCH, PUCCH, etc.).

In various embodiments of the present disclosure, a receiving operationof a UE may include a decoding operation and/or receiving operation of asidelink channel and/or sidelink signal (e.g., PSCCH, PSSCH, PSFCH,PSBCH, PSSS/SSSS, etc.). The receiving operation of the UE may include adecoding operation and/or receiving operation of a WAN DL channel and/ora WAN DL signal (e.g., PDCCH, PDSCH, PSS/SSS, etc.). The receivingoperation of the UE may include a sensing operation and/or a CBRmeasurement operation. In various embodiments of the present disclosure,the sensing operation of the UE may include a PSSCH-RSRP measurementoperation based on a PSSCH DM-RS sequence, a PSSCH-RSRP measurementoperation based on a PSSCH DM-RS sequence scheduled by a PSCCHsuccessfully decoded by the UE, a sidelink RSSU (S-RSSI) measurementoperation, and an S-RSSI measurement operation based on a V2X resourcepool related subchannel. In various embodiments of the disclosure, atransmitting operation of the UE may include a transmitting operation ofa sidelink channel and/or a sidelink signal (e.g., PSCCH, PSSCH, PSFCH,PSBCH, PSSS/SSSS. etc.). The transmitting operation of the UE mayinclude a transmitting operation of a WAN UL channel and/or a WAN ULsignal (e.g., PUSCH, PUCCH, SRS, etc.). In various embodiments of thepresent disclosure, a synchronization signal may include SLSS and/orPSBCH.

In various embodiments of the present disclosure, a configuration mayinclude signaling, signaling from a network, a configuration from thenetwork, and/or a pre-configuration from the network. In variousembodiments of the present disclosure, a definition may includesignaling, signaling from a network, a configuration form the network,and/or a pre-configuration from the network. In various embodiment ofthe present disclosure, a designation may include signaling, signalingfrom a network, a configuration from the network, and/or apre-configuration from the network.

In various embodiments of the present disclosure, a ProSe per packetpriority (PPPP) may be replaced with a ProSe per packet reliability(PPPR), and the PPPR may be replaced with the PPPP. For example, it maymean that the smaller the PPPP value, the higher the priority, and thatthe greater the PPPP value, the lower the priority. For example, it maymean that the smaller the PPPR value, the higher the reliability, andthat the greater the PPPR value, the lower the reliability. For example,a PPPP value related to a service, packet, or message related to a highpriority may be smaller than a PPPP value related to a service, packet,or message related to a low priority. For example, a PPPR value relatedto a service, packet, or message related to a high reliability may besmaller than a PPPR value related to a service, packet, or messagerelated to a low reliability

In various embodiments of the present disclosure, a session may includeat least any one of a unicast session (e.g., unicast session forsidelink), a groupcast/multicast session (e.g., groupcast/multicastsession for sidelink), and/or a broadcast session (e.g., broadcastsession for sidelink).

In various embodiments of the present disclosure, a carrier may beinterpreted as at least any one of a BWP and/or a resource pool. Forexample, the carrier may include at least any one of the BWP and/or theresource pool. For example, the carrier may include one or more BWPs.For example, the BWP may include one or more resource pools.

Hereinafter, a physical channel and signal transmission procedure willbe described.

FIG. 12 shows an example of physical channel and signal transmission towhich the present disclosure is applicable.

Referring to FIG. 12, in step S11, a UE which is powered on again in apower-off state or which newly enters a cell may perform an initial cellsearch operation such as synchronization with a BS. To this end, the UEmay receive a primary synchronization channel (PSCH) and a secondarysynchronization channel (SSCH) from the BS to synchronize with the BS,and may acquire information such as a cell identity (ID). In addition,the UE may receive a physical broadcast channel (PBCH) from the BS toacquire broadcast information in a cell. In addition, in step of initialcell search, the UE may receive a downlink reference signal (DL RS) tocheck a downlink channel state.

In step S12, the UE which has completed the initial cell search mayreceive a physical downlink control channel (PDCCH) and itscorresponding physical downlink shared channel (PDSCH) to acquire morespecific system information.

Thereafter, in steps S13 to S16, the UE may perform a random accessprocedure to complete an access to the BS. Specifically, in step S13,the UE may transmit a preamble through a physical random access channel(PRACH), and in step S14, the UE may receive a random access response(RAR) for the preamble through a PDCCH and its corresponding PDSCH.Thereafter, in step S15, the UE may use scheduling information in theRAR to transmit a physical uplink shared channel (PUSCH), and in stepS16, the UE may perform a contention resolution procedure as in thePDCCH and its corresponding PDSCH.

After performing the aforementioned procedure, in step S17, the UE mayreceive the PDCCH/PDSCH as a general uplink/downlink signal transmissionprocedure, and in step S18, the UE may transmit a PUSCH/physical uplinkcontrol channel (PUCCH). Control information transmitted by the UE tothe BS may be referred to as uplink control information (UCI). The UCImay include hybrid automatic repeat and request (HARD) acknowledgement(ACK)/negative-ACK (HACK), scheduling request (SR), channel stateinformation (CSI), or the like. The CSI may include a channel qualityindicator (CQI), a precoding matrix indicator (PMI), a rank indication(RI), or the like. In general, the UCI is transmitted through the PUCCH.However, when control information and data are to be transmittedsimultaneously, the UCI may be transmitted through the PUSCH. Inaddition, the UE may aperiodically transmit the UCI through the PUSCHaccording to a request/instruction of a network.

Hereinafter, cell search will be described.

The cell search is a procedure in which a UE acquires time and frequencysynchronization for a cell and detects a physical layer cell ID of thecell. The UE receives a primary synchronization signal (PSS) and asecondary synchronization signal (SSS) to perform the cell search.

The UE shall assume that reception occasions of the PBCH, PSS, and SSSare present across consecutive symbols, and an SS/PBCH block is formed.The UE shall assume that SSS, PBCH DM-RS, and PBCH data have the sameEPRE. The UE may assume that a ratio of SSS EPRE to PSS EPRE is 0 dB or3 dB in an SS/PBCH block of a corresponding cell.

The cell search procedure of the UE may be summarized as shown in Table5 below.

TABLE 5 Signal type Action Step 1 PSS Acquire SS/PBCH block (SSB) symboltiming Search for cell ID within cell ID group (3 hypotheses) Step 2SSS * Detect cell ID group (336 hypotheses) Step 3 PBCH DMRS SSB indexand half frame index (Detect slot and frame boundary) Step 4 PBCH Timeinformation (80 ms, SFN, SSB index, HF) * Configure RMSI CORESET/searchspace Step 5 PDCCH and Cell access information PDSCH * Configure RACH

Meanwhile, under a communication environment between the BS and the UEaccording to an embodiment, when the UE reports aperiodic CSI(hereinafter, referred to as A-CSI), the BS may use, for example, anuplink grant to trigger the A-CSI reporting to the UE or to allocate aresource to be used in the A-CSI reporting. In this case, from aperspective of the UE, it may not be necessary to perform an independentscheduling request (SR) and/or buffer status report (BSR) procedure forthe A-CSI reporting. However, an operation in which a mode-1 UE reportssidelink (SL) communication-related A-CSI (hereinafter, SL A-CSI) to theBS or reports the SL A-CSI to another UE (which has triggered SL A-CSIreporting) may be triggered for the mode-1 UE (even if it is notrecognized in advance by the BS) according to whether a predeterminedcondition is satisfied, a change in SL channel quality, how frequently adata transmission failure occurs (or SL HARQ feedback information), orthe like. In an embodiment, the “condition” may be defined as a casewhere SL resource reselection is performed and/or a case where SLchannel busy ratio (CBR) value is changed more than a predeterminedthreshold compared to a previous (report) value and/or a case where anSL reference signal received power (RSRP) value (between UEs) is changedmore than a predetermined threshold compared to a previous (report)value and/or a case where a reference signal received quality (RSRQ)value (between UEs) is changed more than a predetermined thresholdcompared to a previous (report) value and/or a case where a receivedsignal strength indicator (RSSI) value (between UEs) is changed morethan a predetermined threshold compared to a previous (report) valueand/or a case where an SL reference signal received power (RSRP) value(between UEs) is increased (or decreased) compared to a predeterminedthreshold and/or a case where a reference signal received quality (RSRQ)value (between UEs) is increased (or decreased) compared to apredetermined threshold and/or a case where a received signal strengthindicator (RSSI) (between UEs) is increased (or decreased) compared to apredetermined threshold and/or a case where an SL channel qualityindication (CQI) value (between UEs) is changed more than apredetermined threshold compared to a previous (report) value and/or acase where a precoding matrix indicator (PMI) value (between UEs) ischanged more than a predetermined threshold compared to a previous(report) value and/or a case where a rank indicator (RI) value (betweenUEs) is changed more than a predetermined threshold compared to aprevious (report) value and/or a case where an SL channel qualityindication (CQI) value (between UEs) is increased (or decreased)compared to a predetermined threshold and/or a case where a precodingmatrix indicator (PMI) value (between UEs) is increased (or decreased)compared to a predetermined threshold and/or a case where a rankindicator (RI) value (between UEs) is increased (or decreased) comparedto a predetermined threshold and/or a case where a PC5 RRC connection is(re)established between UE, or the like.

Accordingly, in case of the mode-1 UE which performs SL communication(e.g., unicast communication) with another UE, an independent SRprocedure (different from a case of UL data transmission) may beperformed to request and/or allocate a resource for SL A-CSI reportingto (its serving) BS. Alternatively, in case of the mode-1 UE whichperforms SL communication (e.g., unicast communication) with another UE,an independent SR procedure and/or BSR procedure (different from a caseof UL data transmission) may be performed for (its serving) BS torequest and/or allocate a resource for SL A-CSI reporting.

In an embodiment, when the mode-1 UE performs the SL A-CSI reporting for(its serving) BS, a resource requested through the SR (and/or BSR)procedure may be a UL resource (e.g., PUSCH), and when the mode-1 UEperforms the SL A-CSI reporting for another UE, the resource requestedthrough the SR (and/or BSR) procedure may be an SL resource (e.g.,PSCCH/PSSCH). For example, when the mode-1 UE performs the SL A-CSIreporting for another UE which has triggered the SL A-CSI reporting, theresource requested through the SR (and/or BSR) procedure may be the SLresource (e.g., PSCCH/PSSCH).

In an embodiment, the SL A-CSI information may be defined in a MAC CEformat, and an (independent) SR (and/or BSR) procedure may be performedto request and/or allocate a resource for the SL A-CSR reporting.

In an embodiment, generating and/or reporting of SL A-CSI information ona PHY layer may be included as a triggering condition of an SR procedureof a MAC layer. In an embodiment, triggering of the generating and/orreporting of SL A-CSI information on a PHY layer may be included as thetriggering condition of the SR procedure of the MAC layer. In anembodiment, SL A-CSI reporting based on a PUSCH (or PSSCH) piggyback onthe PHY layer may be included as the triggering condition of the SRprocedure of the MAC layer. In an embodiment, triggering of the SL A-CSIreporting based on a PUSCH (or PSSCH) piggyback on the PHY layer may beincluded as the triggering condition of the SR procedure of the MAClayer. In an embodiment, SL A-CSI reporting based on a PUSCH (or PSSCH)piggyback on the PHY layer may be included as the triggering conditionof the SR procedure and/or BSR procedure of the MAC layer. In anembodiment, generating and triggering of SL A-CSI information on the PHYlayer may be included as the triggering condition of the SR procedureand/or BSR procedure of the MAC layer. In an embodiment, triggering ofthe generating and triggering of SL A-CSI information on the PHY layermay be included as the triggering condition of the SR procedure and/orBSR procedure of the MAC layer.

In an embodiment, when the mode-1 UE performs SL A-CSI reporting for theBS, the SR procedure may be interpreted as a UL grant request procedure.In an embodiment, when the mode-1 UE performs the SL A-CSI reporting for(its serving) BS, the SR (and/or BSR) procedure may be interpreted as aUL grant request procedure (for resource allocation (e.g., PUSCH) forthe SL A-SCI reporting).

In addition, in an embodiment, when the mode-1 UE performs the SL A-CSIreporting for another UE, the SR procedure may be interpreted as the SLgrant request procedure. In an embodiment, when the mode-1 UE performsthe SL A-CSI reporting to another UE (which has triggered the SL A-CSIreporting), the SR (and/or BSR) procedure may be interpreted as the SLgrant request procedure (for resource allocation (e.g., PSCCH/PSSCH) forthe SL A-SCI reporting).

In an embodiment, the UE may use a container of a MAC CE format (or acontainer of a PHY signaling format) when reporting the SLA-CSI to theBS, and the UE may use the container based on PHY signaling (or thecontainer of the MAC CE format) when reporting the SL A-CSI to anotherUE. For example, the UE may use the container of the MAC CE format (orthe container of the PHY signaling format) when reporting the SL A-CSIto (its serving) BS, and the UE may use the container based on PHYsignaling (or the container of the MAC CE format) when reporting the SLA-CSI to another UE (which has triggered the SL A-CSI reporting). Thatis, a container to be used may be different when a reporting target isdifferent. In addition, in an embodiment, the proposed content is notlimited to “MAC CE”, and is also extendedly applicable to a case ofusing another container including L3 signaling (e.g., RRC) or the like.

When the UE transmits only the SLA-CSI through the PSSCH, a QoSparameter (e.g., priority) (e.g., sensing purpose) on an associatedPSCCH may be predetermined.

In addition, the proposed scheme described above is also extendedlyapplicable not only when the mode-1 UE performs SL A-CSI reporting tothe BS but also when the mode-1 UE reports the SL A-CSI to another UEand when requesting the BS to allocate an SL resource related to the SLA-CSI reporting. For example, the proposed scheme described above isalso extendedly applicable not only when the mode-1 UE performs SL A-CSIreporting to (its serving) BS but also when the mode-1 UE reports the SLA-CSI to another UE (which has triggered the SL A-CSI reporting) andwhen requesting to (its serving) BS to allocate the SL resource relatedto the SL A-CSI reporting.

The mode 1 may indicate a mode in which the BS schedules a resourcerelated to SL communication (e.g., SL transmission) to the UE, and themode 2 may indicate a mode in which the UE independently selects theresource related to SL communication (e.g., SL transmission) within aresource pool configured in advance (from a network).

FIG. 13 shows a process in which a first apparatus transmits SL CSI to asecond apparatus, based on communication with a BS, in accordance withan embodiment of the present disclosure.

As shown in FIG. 13, a first apparatus 1302 according to an embodimentmay report (or transmit) SL-CSI to another UE (a second apparatus 1303in case of FIG. 13). The first apparatus 1302 according to an embodimentmay correspond to a mode-1 UE.

A process in which the first apparatus 1302 reports SL-SCI to the secondapparatus 1303 is specified as follows.

In step S1310, the first apparatus 1302 according to an embodiment mayreceive an SL CSI-RS and/or SL CSI request from the second apparatus1303. In an embodiment, generating and/or transmitting (or reporting) ofthe SL CSI may be triggered in the first apparatus 1302, based on the SLCSI-RS and/or SL CSI request. However, step S1310 is not an essentialprocedure required when the first apparatus 1302 transmits SL CSI to thesecond apparatus 1303. The first apparatus 1302 according to anembodiment may transmit the SL CSI, based on step S1320 to step S1350,except for step S1310.

In an embodiment, generating and/or transmitting (or reporting) of theSL CSI of the first apparatus 1302 may be triggered based on at leastone of cases where the SL resource is reselected, where an SL channelbusy ratio (CBR) value is increased compared to a predeterminedthreshold, where a reference signal received power (RSRP) value isincreased compared to a predetermined threshold, where the RSRP value isincreased compared to a predetermined threshold, where a received signalstrength indicator (RSSI) value is increased compared to a predeterminedthreshold, where an SL CQI value is increased compared to apredetermined threshold, where an SL PMI value is increased compared toa predetermined threshold, where an SL RI value is increased compared toa predetermined threshold, and where a PC5 RRC connection is establishedbetween UEs.

In step S1320, the first apparatus 1302 according to an embodiment maygenerate SL CSI. In an embodiment, the SL CSI may be generated in a PHYlayer of the first apparatus 1302. In an embodiment, the SL CSI may betransferred from the PHY layer of the first apparatus 1302 to a MAClayer of the first apparatus 1302.

In step S1330, the first apparatus 1302 according to an embodiment maytransmit a scheduling request (SR) to a BS 1301. In an embodiment, theSR may be triggered by the SL CSI transferred from the PHY layer to theMAC layer. In an embodiment, the SR may be triggered in the MAC layer,based on the SL CSI transferred from the PHAY layer to the MAC layer.

In step S1340, the first apparatus 1302 according to an embodiment mayreceive information on an SL resource from the BS 1301. The informationon the SL resource may be determined and/or generated by the BS 1301,based on the SR.

In step S1350, the first apparatus 1302 according to an embodiment maytransmit SL CSI to the second apparatus 1303. In an embodiment, the SLCSI may be transmitted to the second apparatus 1303 through a MAC CE, onan SL resource derived based on the information on the SL resourcereceived from the BS 1301.

FIG. 14 shows a process in which a first apparatus transmits SL CSI to aBS or a second apparatus, based on communication with the BS, inaccordance with another embodiment of the present disclosure.

As shown in FIG. 14, a first apparatus 1402 according to an embodimentmay not only report (or transmit) SL-CSI to another UE (a secondapparatus 1403 in case of FIG. 14) but also report (or transmit) SL-CSIto a BS 1401. The first apparatus 1402 according to an embodiment maycorrespond to a mode-1 UE.

Meanwhile, an embodiment in which the first apparatus 1402 reports theSL-CSI to the second apparatus 1303 or 1403 and/or the BS 1301 or 1401is not limited to FIG. 13 and FIG. 14. For example, the first apparatus1402 may report the SL-CSI only to the BS 1401.

Meanwhile, although it is described in FIG. 14 that the first apparatus1402 first reports the SL-CSI to the second apparatus 1403 (S1440) andthen reports the SL-CSI to the BS 1401 (S1470), an embodiment is notlimited thereto. For example, the first apparatus 1402 may first reportthe SL-CSI to the BS 1401 and then may report the SL-CSI to the secondapparatus 1403. In addition, it will be easily understood by thoseordinarily skilled in the art that operation orders are not limited byreference numerals indicated in FIG. 13 and FIG. 14.

Since steps S1410 to S1440 of FIG. 14 perform a function identical orsimilar to steps S1310 to S1340 of FIG. 13, descriptions on step S1410to S1440 will be omitted.

In step S1450, the first apparatus 1402 according to an embodiment maytransmit a second SR to the BS 1401 (S1450). The second SR may bedifferent from the first SR transmitted to the BS 1401 to acquireinformation on an SL resource.

In step S1460, the first apparatus 1402 according to an embodiment mayreceive information related to a UL resource determined based on thesecond SR from the BS 1401 (S1460). In an embodiment, the informationrelated to the UL resource (or the information on the UL resource may beincluded in a UL grant transmitted from the BS 1401.

In step S1470, the first apparatus 1402 according to an embodiment maytransmit (or report) SL CSI to the BS 1401. In an embodiment, the firstapparatus 1402 may transmit the SL CSI to the BS 1401, on a UL resourcederived based on the information related to the UL resource receivedfrom the BS 1401. In an embodiment, the SL CSI may be transmitted fromthe first apparatus 1402 to the BS 1401 on the UL resource, through aMAC CE.

FIG. 15 shows a process in which a first apparatus transmits SL CSI to asecond apparatus, in accordance with an embodiment of the presentdisclosure.

As shown in FIG. 15, a first apparatus 1501 according to an embodimentmay report (or transmit) SL-CSI to another UE (a second apparatus 1502in case of FIG. 15), not based on a result of communication with a BS.The first apparatus 1501 according to an embodiment may correspond to amode-2 UE.

A process in which the first apparatus 1501 reports SL-SCI to the secondapparatus 1502 is specified as follows.

In step S1510, the first apparatus 1501 according to an embodiment mayreceive an SL CSI-RS and/or SL CSI request from the second apparatus1502. In an embodiment, generating and/or transmitting (or reporting) ofthe SL CSI may be triggered in the first apparatus 1501, based on the SLCSI-RS and/or SL CSI request. However, step S1510 is not an essentialprocedure required when the first apparatus 1501 transmits SL CSI to thesecond apparatus 1502. The first apparatus 1501 according to anembodiment may transmit the SL CSI, based on step S1520 to step S1540,except for step S1510.

In an embodiment, generating and/or transmitting (or reporting) of theSL CSI of the first apparatus 1501 may be triggered based on at leastone of cases where the SL resource is reselected, where an SL channelbusy ratio (CBR) value is increased compared to a predeterminedthreshold, where a reference signal received power (RSRP) value isincreased compared to a predetermined threshold, where the RSRP value isincreased compared to a predetermined threshold, where a received signalstrength indicator (RSSI) value is increased compared to a predeterminedthreshold, where an SL CQI value is increased compared to apredetermined threshold, where an SL PMI value is increased compared toa predetermined threshold, where an SL RI value is increased compared toa predetermined threshold, and where a PC5 RRC connection is establishedbetween UEs.

In step 1520, the first apparatus 1501 according to an embodiment maygenerate SL CSI. In an embodiment, the SL CSI may be generated in a PHYlayer of the first apparatus 1501. In an embodiment, the SL CSI may betransferred from the PHY layer of the first apparatus 1501 to a MAClayer of the first apparatus 1501.

In step S1530, the first apparatus 1501 according to an embodiment maydetermine an SL resource for transmitting SL CSI to the second apparatus1502.

In an embodiment, the SL resource for transmitting the SL CSI to thesecond apparatus 1502 may be a pre-configured resource.

In another embodiment, the SL resource for transmitting the SL CSI tothe second apparatus 1502 may be an SL resource determined by the firstapparatus 1501, based on resource selection.

In step S1540, the first apparatus 1501 according to an embodiment maytransmit the SL CSI to the second apparatus 1502 through the SLresource. In an embodiment, the SL CSI may be transmitted to the secondapparatus 1502 through a MAC CE on the SL resource. In an embodiment,the SL CSI may be transmitted to the second apparatus 1502 through theMAC CE, on the SL resource determined based on resource selection.

FIG. 16 is a flowchart showing an operation of a first apparatus, inaccordance with an embodiment of the present disclosure.

Operations disclosed in the flowchart of FIG. 16 may be performed incombination with various embodiments of the present disclosure. In anembodiment, the operations disclosed in the flowchart of FIG. 16 may beperformed based on at least one of apparatuses shown in FIG. 18 to FIG.23.

In step S1610, the first apparatus according to an embodiment maygenerate SL CSI related to a channel state between the first apparatusand a second apparatus in a MAC CE format.

In step S1620, the first apparatus according to an embodiment maytransmit the SL CSI to the second apparatus.

In an embodiment, the generating of the SL CSI and the transmitting ofthe SL CSI to the second apparatus may be triggered by PHY layersignaling related to reporting triggering of the SL CSI.

In an embodiment, a priority for the SL CSI of the MAC CE format may bepredetermined. That is, the priority for the SL CSI of the MAC CE formatmay be predefined. The priority for the SL CSI of the MAC CE format maybe configured from a BS or may be based on a pre-configuration.

The first apparatus according to an embodiment may transmit a firstscheduling request (SR) to the BS.

In an embodiment, the first SR may be triggered by the SL CSI of the MACCE format, generated by the PHY layer signaling related to the reportingtriggering of the SL CSI.

The first apparatus according to an embodiment may receive an SL grantfrom the BS. The SL CSI may be transmitted to the second apparatusthrough the MAC CE on an SL resource related to the SL grant.

In an embodiment, the SL grant may be related to the first SRtransmitted to the BS.

The first apparatus according to an embodiment may transmit a second SRto the BS, receive a UL grant from the BS, and transmit the SL CSI tothe BS on a UL resource related to the UL grant.

In an embodiment, the SL CSI may be transmitted to the BS through theMAC CE on the UL resource

In an embodiment, the UL grant may be related to the second SR.

In an embodiment, the SL CSI may include at least one of a channelquality indicator (CQI), a precoding matrix indicator (PMI), and a rankindicator (RI).

In an embodiment, the SL CSI may be transmitted to the BS, based on atleast one of cases where the SL resource is reselected, where an SLchannel busy ratio (CBR) value is increased compared to a predeterminedthreshold, where a reference signal received power (RSRP) value isincreased compared to a predetermined threshold, where the RSRP value isincreased compared to a predetermined threshold, where a received signalstrength indicator (RSSI) value is increased compared to a predeterminedthreshold, where an SL CQI value is increased compared to apredetermined threshold, where an SL PMI value is increased compared toa predetermined threshold, where an SL RI value is increased compared toa predetermined threshold, and where a PC5 RRC connection is establishedbetween UEs.

The first apparatus according to an embodiment may determine an SLresource for transmitting the SL CSI to the second apparatus, based onresource selection, and may transmit the SL CSI to the second apparatusthrough the MAC CE, based on the SL resource.

The first apparatus according to an embodiment may generate the SL CSIrelated to a channel state between the first apparatus and a secondapparatus in a MAC layer in a MAC control element (CE) format.

The first apparatus according to an embodiment may transmit to the BS afirst scheduling request (SR) triggered based on the SL CSI of the MACCE format.

The first apparatus according to an embodiment may receive an SL grantfrom the BS.

The first apparatus according to an embodiment may transmit the SL CSIto the second apparatus on an SL resource related to the SL grant.

In an embodiment, the transmission of the first SR may be triggered bythe PHY layer signaling related to the reporting triggering of the SLCSI.

In an embodiment, a buffer status report (BSR) related to the SL CSI fortriggering the transmission of the first SR may not be defined, and thetransmission of the first SR may not be triggered by the BSR.

In an embodiment, a first SR configuration for the first SR and a secondSR configuration for a second SR triggered based on the BSR may bedifferent from each other, and the BSR related to the second SRconfiguration may be related to at least one of SL data or UL data notrelated to the SL CSI of the MAC CE format.

For example, if an SR configuration related to SL data and an SRconfiguration related to SL CSI are configured independently ordifferently for a mode-1 UE, the mode-1 UE may apply at least any one ofthe following options. For example, the SR configuration may includeinformation related to an SR resource, information related to a period,and/or information related to a slot offset, or the like.

1) First Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may transmit an SR to a BS, based on only the SR configurationrelated to the SL data. Herein, a corresponding rule may be useful in asituation in which a BSR related to SL CSI is not defined (unlike in SLdata). In this case, for example, the mode-1 UE may omit SR transmissionbased on the SR configuration related to the SL CSI.

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may transmit an SR to the BS, based on only the SRconfiguration related to the SL CSI. In this case, for example, themode-1 UE may omit SR transmission based on the SR configuration basedon the SL data.

2) Second Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may perform both SR transmission based on the SR configurationrelated to the SL CSI and SR transmission based on the SR configurationrelated to the SL data.

3) Third Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may apply the second option (or first option) when a remaininglatency budget related to SL CSI reporting is not sufficient for a(processing) relay required in SR transmission based on an SRconfiguration related to SL CSI reporting. Otherwise, the mode-1 UE mayapply the first option (or second option).

According to an embodiment of the present disclosure, there may beprovided a first apparatus for transmitting SL CSI. The first apparatusmay include at least one memory storing instructions, at least onetransceiver, and at least one processor connected to the at least onememory and the at least one transceiver. The at least one processor maybe configured to generate the SL CSI related to a channel state betweenthe first apparatus and a second apparatus in a MAC CE format, andcontrol the at least one transceiver to transmit the SL CSI to thesecond apparatus.

According to an embodiment of the present disclosure, there may beprovided an apparatus (or a chip(set)) configured to control a firstuser equipment (UE). The apparatus may include at least one processor,and at least one computer memory operably connectable to the at leastone processor, and storing instructions. The at least one processor mayexecute the instructions to generate the SL CSI related to a channelstate between the first apparatus and a second apparatus in a MAC CEformat, and transmit the SL CSI to the second apparatus.

In an embodiment, the first UE of the embodiment may represent the firstapparatus described throughout the present disclosure. In an embodiment,the at least one processor, at least one memory, or the like in theapparatus for controlling the first UE may be implemented as respectiveseparate sub chips, or at least two or more components may beimplemented through one sub chip.

According to an embodiment of the present disclosure, there may beprovided a non-transitory computer-readable storage medium havinginstructions (or indications) stored thereon. When executed by at leastone processor, the instructions may cause the at least one processor togenerate, by a first apparatus, SL CSI related to a channel statebetween the first apparatus and a second apparatus in a MAC CE format,and transmit, by the first apparatus, the SL CSI to the secondapparatus.

FIG. 17 is a flowchart showing an operation of a second apparatus, inaccordance with an embodiment of the present disclosure.

Operations disclosed in the flowchart of FIG. 17 may be performed incombination with various embodiments of the present disclosure. In anembodiment, the operations disclosed in the flowchart of FIG. 17 may beperformed based on at least one of apparatuses shown in FIG. 18 to FIG.23.

In step S1710, the second apparatus according to an embodiment mayreceive, from the first apparatus, SL CSI of a MAC CE format related toa channel state between the first apparatus and the second apparatus.

In an embodiment, the generating of the SL CSI and the transmitting ofthe SL CSI to the second apparatus may be triggered by PHY layersignaling related to reporting triggering of the SL CSI.

In an embodiment, a priority for the SL CSI of the MAC CE format may bepredetermined. That is, the priority for the SL CSI of the MAC CE formatmay be predefined. The priority for the SL CSI of the MAC CE format maybe configured from a BS or may be based on a pre-configuration.

The first apparatus according to an embodiment may transmit a firstscheduling request (SR) to the BS.

In an embodiment, the first SR may be triggered by the SL CSI of the MACCE format, generated by the PHY layer signaling related to the reportingtriggering of the SL CSI.

The first apparatus according to an embodiment may receive an SL grantfrom the BS. The SL CSI may be transmitted to the second apparatusthrough the MAC CE on an SL resource related to the SL grant.

In an embodiment, the SL grant may be related to the first SRtransmitted to the BS.

The first apparatus according to an embodiment may transmit a second SRto the BS, receive a UL grant from the BS, and transmit the SL CSI tothe BS on a UL resource related to the UL grant.

In an embodiment, the SL CSI may be transmitted to the BS through theMAC CE on the UL resource

In an embodiment, the UL grant may be related to the second SR.

In an embodiment, the SL CSI may include at least one of a channelquality indicator (CQI), a precoding matrix indicator (PMI), and a rankindicator (RI).

In an embodiment, the SL CSI may be transmitted to the BS, based on atleast one of cases where the SL resource is reselected, where an SLchannel busy ratio (CBR) value is increased compared to a predeterminedthreshold, where a reference signal received power (RSRP) value isincreased compared to a predetermined threshold, where the RSRP value isincreased compared to a predetermined threshold, where a received signalstrength indicator (RSSI) value is increased compared to a predeterminedthreshold, where an SL CQI value is increased compared to apredetermined threshold, where an SL PMI value is increased compared toa predetermined threshold, where an SL RI value is increased compared toa predetermined threshold, and where a PC5 RRC connection is establishedbetween UEs.

The first apparatus according to an embodiment may determine an SLresource for transmitting the SL CSI to the second apparatus, based onresource selection, and may transmit the SL CSI to the second apparatusthrough the MAC CE, based on the SL resource.

The first apparatus according to an embodiment may generate the SL CSIrelated to a channel state between the first apparatus and a secondapparatus in a MAC layer in a MAC control element (CE) format.

The first apparatus according to an embodiment may transmit to the BS afirst scheduling request (SR) triggered based on the SL CSI of the MACCE format.

The first apparatus according to an embodiment may receive an SL grantfrom the BS.

The first apparatus according to an embodiment may transmit the SL CSIto the second apparatus on an SL resource related to the SL grant.

In an embodiment, the transmission of the first SR may be triggered bythe PHY layer signaling related to the reporting triggering of the SLCSI.

In an embodiment, a buffer status report (BSR) related to the SL CSI fortriggering the transmission of the first SR may not be defined, and thetransmission of the first SR may not be triggered by the BSR.

In an embodiment, a first SR configuration for the first SR and a secondSR configuration for a second SR triggered based on the BSR may bedifferent from each other, and the BSR related to the second SRconfiguration may be related to at least one of SL data or UL data notrelated to the SL CSI of the MAC CE format.

For example, if an SR configuration related to SL data and an SRconfiguration related to SL CSI are configured independently ordifferently for a mode-1 UE, the mode-1 UE may apply at least any one ofthe following options. For example, the SR configuration may includeinformation related to an SR resource, information related to a period,and/or information related to a slot offset, or the like.

1) First Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may transmit an SR to a BS, based on only the SR configurationrelated to the SL data. Herein, a corresponding rule may be useful in asituation in which a BSR related to SL CSI is not defined (unlike in SLdata). In this case, for example, the mode-1 UE may omit SR transmissionbased on the SR configuration related to the SL CSI.

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may transmit an SR to the BS, based on only the SRconfiguration related to the SL CSI. In this case, for example, themode-1 UE may omit SR transmission based on the SR configuration basedon the SL data.

2) Second Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may perform both SR transmission based on the SR configurationrelated to the SL CSI and SR transmission based on the SR configurationrelated to the SL data.

3) Third Option

For example, when the mode-1 UE simultaneously performs transmissionrelated to SL data and transmission related to SL CSI and/or when themode-1 UE multiplexes the SL data and the SL CSI on one MAC PDU, themode-1 UE may apply the second option (or first option) when a remaininglatency budget related to SL CSI reporting is not sufficient for a(processing) relay required in SR transmission based on an SRconfiguration related to SL CSI reporting. Otherwise, the mode-1 UE mayapply the first option (or second option).

According to an embodiment of the present disclosure, there is provideda second apparatus for receiving SL CSI. The second apparatus mayinclude at least one memory storing instructions, at least onetransceiver, and at least one processor connected to the at least onememory and the at least one transceiver. The at least one processor maycontrol the at least one transceiver to receive, from a first apparatus,SL CSI of a MAC CE format related to a channel state between the firstapparatus and the second apparatus.

Various embodiments of the present disclosure may be independentlyimplemented. Alternatively, the various embodiments of the presentdisclosure may be implemented by being combined or merged. For example,although the various embodiments of the present disclosure have beendescribed based on the 3GPP LTE system for convenience of explanation,the various embodiments of the present disclosure may also be extendedlyapplied to another system other than the 3GPP LTE system. For example,the various embodiments of the present disclosure may also be used in anuplink or downlink case without being limited only to directcommunication between terminals. In this case, a base station, a relaynode, or the like may use the proposed method according to variousembodiments of the present disclosure. For example, it may be definedthat information on whether to apply the method according to variousembodiments of the present disclosure is reported by the base station tothe terminal or by a transmitting terminal to a receiving terminalthrough pre-defined signaling (e.g., physical layer signaling or higherlayer signaling). For example, it may be defined that information on arule according to various embodiments of the present disclosure isreported by the base station to the terminal or by a transmittingterminal to a receiving terminal through pre-defined signaling (e.g.,physical layer signaling or higher layer signaling). For example, someembodiments among various embodiments of the present disclosure may beapplied limitedly only to a resource allocation mode 1. For example,some embodiments among various embodiments of the present disclosure maybe applied limitedly only to a resource allocation mode 2.

Hereinafter, an apparatus to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 18 shows a communication system 1, in accordance with an embodimentof the present disclosure.

Referring to FIG. 18, a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 19 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

Referring to FIG. 19, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 18.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherapparatuses. The one or more transceivers 106 and 206 may receive userdata, control information, and/or radio signals/channels, mentioned inthe descriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother apparatuses. For example, the one or more transceivers 106 and 206may be connected to the one or more processors 102 and 202 and transmitand receive radio signals. For example, the one or more processors 102and 202 may perform control so that the one or more transceivers 106 and206 may transmit user data, control information, or radio signals to oneor more other apparatuses. In addition, the one or more processors 102and 202 may perform control so that the one or more transceivers 106 and206 may receive user data, control information, or radio signals fromone or more other apparatuses. In addition, the one or more transceivers106 and 206 may be connected to the one or more antennas 108 and 208 andthe one or more transceivers 106 and 206 may be configured to transmitand receive user data, control information, and/or radiosignals/channels, mentioned in the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument, through the one or more antennas 108 and 208. In thisdocument, the one or more antennas may be a plurality of physicalantennas or a plurality of logical antennas (e.g., antenna ports). Theone or more transceivers 106 and 206 may convert received radiosignals/channels etc. from RF band signals into baseband signals inorder to process received user data, control information, radiosignals/channels, etc. using the one or more processors 102 and 202. Theone or more transceivers 106 and 206 may convert the user data, controlinformation, radio signals/channels, etc. processed using the one ormore processors 102 and 202 from the base band signals into the RF bandsignals. To this end, the one or more transceivers 106 and 206 mayinclude (analog) oscillators and/or filters.

FIG. 20 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 20, a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 20 may be performed by, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 19. Hardwareelements of FIG. 20 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 19. For example, blocks 1010to 1060 may be implemented by the processors 102 and 202 of FIG. 19.Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 19 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 19.

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 20. Herein, the codewords are encoded bit sequencesof information blocks. The information blocks may include transportblocks (e.g., a UL-SCH transport block, a DL-SCH transport block). Theradio signals may be transmitted through various physical channels(e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 18. For example, the wireless devices(e.g., 100 and 200 of FIG. 17) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 21 shows a wireless device, in accordance with an embodiment of thepresent disclosure. The wireless device may be implemented in variousforms according to a use-case/service (see FIG. 18).

Referring to FIG. 21, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 19 and may be configured by variouselements, components, units/portions, and/or modules. For example, eachof the wireless devices 100 and 200 may include a communication unit110, a control unit 120, a memory unit 130, and additional components140. The communication unit may include a communication circuit 112 andtransceiver(s) 114. For example, the communication circuit 112 mayinclude the one or more processors 102 and 202 and/or the one or morememories 104 and 204 of FIG. 19. For example, the transceiver(s) 114 mayinclude the one or more transceivers 106 and 206 and/or the one or moreantennas 108 and 208 of FIG. 19. The control unit 120 is electricallyconnected to the communication unit 110, the memory 130, and theadditional components 140 and controls overall operation of the wirelessdevices. For example, the control unit 120 may control anelectric/mechanical operation of the wireless device based onprograms/code/commands/information stored in the memory unit 130. Inaddition, the control unit 120 may transmit the information stored inthe memory unit 130 to the exterior (e.g., other communication devices)via the communication unit 110 through a wireless/wired interface orstore, in the memory unit 130, information received through thewireless/wired interface from the exterior (e.g., other communicationdevices) via the communication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 18), the vehicles (100 b-1 and 100 b-2 of FIG. 18), the XRdevice (100 c of FIG. 18), the hand-held device (100 d of FIG. 18), thehome appliance (100 e of FIG. 18), the IoT device (100 f of FIG. 18), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 18), the BSs (200 of FIG. 18), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 21, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 21 will be described indetail with reference to the drawings.

FIG. 22 shows a hand-held device, in accordance with an embodiment ofthe present disclosure. The hand-held device may include a smartphone, asmartpad, a wearable device (e.g., a smartwatch or a smartglasses), or aportable computer (e.g., a notebook). The hand-held device may bereferred to as a Mobile Station (MS), a User Terminal (UT), a MobileSubscriber Station (MSS), a Subscriber Station (SS), an Advanced MobileStation (AMS), or a Wireless Terminal (WT).

Referring to FIG. 22, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c.The antenna unit 108 may be configured as a part of the communicationunit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110to 130/140 of FIG. 19, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. In addition, the memory unit 130 may store input/outputdata/information. The power supply unit 140 a may supply power to thehand-held device 100 and include a wired/wireless charging circuit, abattery, etc. The interface unit 140 b may support connection of thehand-held device 100 to other external devices. The interface unit 140 bmay include various ports (e.g., an audio I/O port and a video I/O port)for connection with external devices. The I/O unit 140 c may input oroutput video information/signals, audio information/signals, data,and/or information input by a user. The I/O unit 140 c may include acamera, a microphone, a user input unit, a display unit 140 d, aspeaker, and/or a haptic module.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 23 shows a car or an autonomous vehicle, in accordance with anembodiment of the present disclosure. The car or autonomous vehicle maybe implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 23, a car or autonomous vehicle 100 may include anantenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 21, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. Inaddition, in the middle of autonomous driving, the sensor unit 140 c mayobtain a vehicle state and/or surrounding environment information. Theautonomous driving unit 140 d may update the autonomous driving path andthe driving plan based on the newly obtained data/information. Thecommunication unit 110 may transfer information about a vehicleposition, the autonomous driving path, and/or the driving plan to theexternal server. The external server may predict traffic informationdata using AI technology, etc., based on the information collected fromvehicles or autonomous vehicles and provide the predicted trafficinformation data to the vehicles or the autonomous vehicles.

The scope of the disclosure may be represented by the following claims,and it should be construed that all changes or modifications derivedfrom the meaning and scope of the claims and their equivalents may beincluded in the scope of the disclosure.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method of transmitting sidelink (SL) channelstate information (CSI) by a first apparatus, the method comprising:generating the SL CSI related to a channel state between the firstapparatus and a second apparatus in a medium access control (MAC)control element (CE) format; and transmitting the SL CSI in the MAC CEformat to the second apparatus through MAC layer signaling, wherein thegenerating of the SL CSI in the MAC CE format and the transmitting ofthe SL CSI in the MAC CE format to the second apparatus are triggered bysidelink physical (PHY) layer signaling from the second apparatusrelated to triggering of the transmitting of the SL CSI in the MAC CEformat.
 2. The method of claim 1, wherein a priority for the SL CSI ofthe MAC CE format is predetermined.
 3. The method of claim 1, furthercomprising transmitting a first scheduling request (SR) to a basestation, wherein the first SR is triggered by the SL CSI in the MAC CEformat, generated by the PHY layer signaling from the second apparatusrelated to the triggering of the transmitting of the SL CSI.
 4. Themethod of claim 3, further comprising receiving an SL grant from thebase station, wherein the SL CSI is transmitted to the second apparatusthrough the MAC CE on an SL resource related to the SL grant.
 5. Themethod of claim 4, wherein the SL grant is related to the first SRtransmitted to the base station.
 6. The method of claim 4, furthercomprising: transmitting a second SR to the base station; receiving a ULgrant from the base station; and transmitting the SL CSI to the basestation on a UL resource related to the UL grant.
 7. The method of claim6, wherein the SL CSI is transmitted to the base station through the MACCE on the UL resource.
 8. The method of claim 7, wherein the SL CSI istransmitted to the base station, further based on at least one of cases(i) where the SL resource is reselected, (ii) where an SL channel busyratio (CBR) value is increased compared to a predetermined threshold,(iii) where a reference signal received power (RSRP) value is increasedcompared to a predetermined threshold, (iv) where the RSRP value isincreased compared to a predetermined threshold, (v) where a receivedsignal strength indicator (RSSI) value is increased compared to apredetermined threshold, (vi) where an SL CQI value is increasedcompared to a predetermined threshold, (vii) where an SL PMI value isincreased compared to a predetermined threshold, (viii) where an SL RIvalue is increased compared to a predetermined threshold, or (ix) wherea PC5 RRC connection is established between user equipments (UEs). 9.The method of claim 6, wherein the UL grant is related to the second SR.10. The method of claim 1, wherein the SL CSI includes at least one of achannel quality indicator (CQI), a precoding matrix indicator (PMI), ora rank indicator (RI).
 11. The method of claim 1, wherein thetransmitting of the SL CSI to the second apparatus comprises:determining an SL resource for transmitting the SL CSI to the secondapparatus, based on resource selection; and transmitting the SL CSI tothe second apparatus through the MAC CE, based on the SL resource.
 12. Afirst apparatus configured to transmit sidelink (SL) channel stateinformation (CSI), the first apparatus comprising: at least one memorystoring instructions; at least one transceiver; and at least oneprocessor connected to the at least one memory and the at least onetransceiver, wherein the at least one processor is configured to:generate the SL CSI related to a channel state between the firstapparatus and a second apparatus in a medium access control (MAC)control element (CE) format; and control the at least one transceiver totransmit the SL CSI in the MAC CE format to the second apparatus throughMAC layer signaling, wherein the generating of the SL CSI in the MAC CEformat and the transmitting of the SL CSI in the MAC CE format to thesecond apparatus are triggered by sidelink physical (PHY) layersignaling from the second apparatus related to triggering of thetransmitting of the SL CSI in the MAC CE format.
 13. A processing deviceconfigured to control a first terminal to transmit sidelink (SL) channelstate information (CSI), the processing device comprising: at least oneprocessor; and at least one computer memory operably connectable to theat least one processor, and storing instructions that, based on beingexecuted by the at least one processor, perform operations comprising:generating the SL CSI related to a channel state between the firstterminal and a second terminal in a medium access control (MAC) controlelement (CE) format; and transmitting the SL CSI in the MAC CE format tothe second terminal through MAC layer signaling, wherein the generatingof the SL CSI in the MAC CE format and the transmitting of the SL CSI inthe MAC CE format to the second terminal are triggered by sidelinkphysical (PHY) layer signaling from the second terminal related totriggering of the transmitting of the SL CSI in the MAC CE format.